It's a 4.5 from me. Lovely apartment, just a couple of minor negative things.
Pros: large apartment, with great skyline views, nice balcony for sitting out and enjoying the sunset. Theirs also a fitness centre available to use which is pretty good. Bed was comfy, and there were even some nice welcome gifts. You are very walkable distance from magnificent mile and lots of restaurants and shops. But at the same time I didn't find the apartment noisy and slept well.
Negatives:
The blinds are poor and cheap and let in light. I used a sleeping mask in the bedroom.
I had issues witht the toaster and kettle not working.
Now on the plus side the kasa team were very quick to reply to attempt to get it fixed. However...they seemed to ok it for the maintenance team to "visit at any time" which I had not given approval too. I came back and found a maintenance person in the apartment. Whilst I was thankful for the urgency to get things fixed, I had not given approval for someone to just be in my apartment at any time. I'd say that was a communication. I will say they were very apologetic after I complained. It took 3 attempts to try and fix it. on the 3rd time they again sent a maintenance person round when I had not agreed a time as I could see evidence that someone had used the fuse box. I'm not suggesting a worker would steal something, but I do think people should just turn up without a fixed time.
The website also mentions a pool, which you don't have access to.